Long-stroke pumping jack



March 25, 1930. G. BURT LONG STROKE PUMPING JACK Filed April 16, 1928 r5 Sheets-Sheet 1 INVENTOR Ian Pence ATTORNEY March 25, 1930. 1.. G. BURT 1,752,144

LONG STROKE PUMPING JACK Filed April 16, 1928 s Sheets-Sheet 2.

g INVENTOR law/em Blu ATTORNEY March 25, 1930. L. G. BURT 2,

LONG STROKE PUMPING JACK Filed April 16, 1928 3 Sheets-Sheet 3 9 INVENTOR 7 Lawrence Burt V v ATTORNEY Patented Mar. 25 1930 UNITED STATES miear oFFicE LAwnENcE e. BURT, or TULSA, OKLAHOMA LONG-STROKE PUMPING JACK Application filed April 16, 1928. Serial No. 270,536.

This invention relates to improvements in pumping acks, and 1t consists of the con-' structlons, combinations and arrangements herein described and claimed.

An object of the invention is to providev a pumping jack primarily intended for use in connection with oil wells, a particular attribute of the jack being the ease with which it may be unlimbered from its moorings for temporary displacement preparatory to pulling the'sucker rod should this become necessary. 1

Another object of the invention is to provide a counter weight for'the reciprocating chains, the provision of which includes an dotted lines to facilitate the pulling of the sucker rod,

Figure 3 is a vertical section taken on the line 3-3 of Figure 2, parts being shown in 3Q elevation,

., Figure 4 is a detail horizontal section taken on the line 44; of Figure 2,

Figure 5 is a detail horizontal section taken substantially on the line 5 5 of Figure 2,

Figure 6 is a detail perspective view of the secondary chain grip. 1

In drilling oil wells it is often the case that productive strata will be'encountered 40 under insuflicient gas pressure to cause a voluntary flowing of the well. Such instances require the use of a pump, and usually the pumping power is applied to the pump plunger through anintermediary jack.

The lifting of considerable volumes of oil demands the movement of the pump plunger rover sufficiently great distances to accomplish the purpose. In other words, a long stroke is preferable to a short stroke, and by applying the invention tothe need, theformer constitutes an arrangement by which a long stroke may be supplied. The principle of .the improved jack is such thata stroke of practically unlimited length may be appplied to the well tool.

The-foregoing general statement is subject to some qualification. It is not the ackthat'produces'the stroke. The jack is an instrument through which a long stroke may be applied to the pump plunger. The means for producing the long stroke is known as I a long stroke pumping power which isthe subject of a I companion application filed April 16, 1928, Serial No. 270,537, otherwise known as Case No. 2.

Referenceis made to the drawings. A base,

generally designated 1,.carries a superstructure. generally designated 2. It is upon the superstructure that a flexible element generally indicated 3, is movable. This element is respectively joined with a cable or rod 4 leading to the pumping power (not shown),

7 and Wll'il'l a sucker rod 5. Regardlessofthe character ofthe cable or rod 4 this part is herein known as the power element because by its instrumentality the power is transferred to the pumping jack.

The latter produces reciprocation for a tool in the well casing, thehead ofwhich is indicated at 6. The necessary reciprocation is produced by the reciprocation ofthe element Although the latter runs overv sprockets, as presently appears, it is regard- 'ed',"nevertheless, .as being reciprocable." It

is through the reciprocation ofthe flexible element 3' that the stroke of the sucker rod 5 is produced. Obviously the length-of the stroke is limited only by the capacity of the pumping power, the height of the superstructure 2 and the length of the flexible element 3.

Longitudinal rails 7 and cross pieces 8 down. I

The superstructure 2 comprises the follOWlIW' aarts: a air of beams 10 that are "relationship to the base 1.,

and rear struts 14. I Bearings on the beams 10 carry the shaft 16 of a pair of idler sprockets 1?. Sets of bearings 18 on the top frame carry parallel shafts 19 which have pairs of idler sprockets 20 and 21.

It is the purpose of the top frame 11 to overhang the well casing. The adjacent vertical component of the flexible element 3 displacemern of the sag r tainon-es of the connec i s These connections comprise knuckles 22 and l3 carried by the beams 10, and associated knuckles 24, 25 carried bythe base. These are connected by hinge pins 26 and 2'4". The

-. elements 23. 2 5 and'27 may act; as a hinge upon which the superstructure may be swung to the right in Figure 2;

The elements 22, 24 and 26 may act as a hinge upon which the superstructure may be swung to the left in Figure 2. The latter swinging is a possibility but not a requirement. Usually the requirement is to swing the superstructure to the right preparatory to pulling the sucker rod 5 should this become necessary. For that purpose the hinge pins 26 must be withdrawn. 7 Should an in stance occur in which swinging of the superstructure to the left becomes desirable, the hinge pins 27 would have to be withdrawn.

In either case the struts 14 must be re leased. These are connected with the base by .hin 'e pins 28 that fit pairs of knuckles 29 and 30 respectively on the struts and base. Pins 31 pass through the upper ends of the struts and pairs of ears 32 (Figure 4) on the beams '10. The pins 28 and 31 will form a lock when in position in the various knuckles, holding the superstructure rigid upon the base. Removal of the pins 31 will. permit swinging of the beams 10 and carried parts, provided one or the other of the sets 26, 27 is first removed. The struts 14 may be swung ck out of the way. i

The beams 10 serve as guides fora counter weight 33. This counter weight is composed of a plurality of weight elements. The counter weight constitutes the connector between what are hereafter known as the primary and secondary components of the flexible element 3. The first comprises a pair of chains hat rained over the idler sprockets 1 The second comprises a pair of chains 35 that is trained over the pairs of idler sprockets 20, 21. The chains 34 are closer to each other than are the chains 35. This arrangement has the following advan tage:

The driving power being received by the primary component 34, may be applied substantially at the axis of movement of the counter weight 33. The chains 34 may therefore be disposed close together. But in order that there may be an equalized lift upon the sucker rod 5, and an equalized action in general, it is desirable to dispose the chains a noticeable distance apart.

Thi various spacing of the chains 34 and is acilitated by the construction of the counter weight to which the description now reverts. Lock bolts 36 secure the plurality of weight elements. The lower element carries'a pair of leaves 37 between which the chains are inserted prior to being secured by bolts or pins 38 that pass through the spaces between certain links. In practice o e of the leaves 3'? may be made integral with the bottom element, and the other may merely constitute a loose follower plate to be held in place by the bolts or pins when ap plied. I 7

Similar leaves 39 on the upper weight ele ment receive the chains 35. Bolts or pins 40, passing through spaces between certain li ks firmly hold the chains. Figure 3 it clear that t .e chains 35 are attached to tne counter weight at points farther apart than those which the chains 34 are attached. The counter. weight 33 is intended to substantially counter balance the sucker rod 5 and its carried parts, thus lessening the amount of operating power required. This assemblage of the counter weight will permit the addition or subtraction of weight elements.

A coupling 41 joins the cable or rod 4 with the chains 34. The coupling includes sets of bolts or pins 42 which pass through spaces between certain links. stitutes the primary chain grip. A second ary chain grip comprises theyoke 43shown in Figures 1 and 6. This yoke is made in two parts, and when these are bolted together at the sucker rod 5 is intended to be firmly held by the central enlargement 45.

Upstanding arms 46 make direct connection with the chains 35. Teeth 47 on certain teeth 47. The teeth and bolts combined make a connection that will not come apart in 0rdinary service. 7

The coupling 41 con mpplemental bracing may be employed in practice. Such bracing may comprise guys 50 and a braced front strut 51. The former are anchored to the ground and to the beams 10 as shown in Figure 1, but the anchors are such that swingin of the superstructure to the right will not e interfered with.

The front strut 51 may merely rest upon the flooring, the upper end being secured to the top frame 11. The presence ofthis strut would prevent swinging of the superstructure to the left, and inasmuch as .the latter swinging of the superstructure is a mere possibility and not a probability, it follows that the front strut may be employed in the construction under ordinary circumstances.

The operation is readily understood. Reference must be made to the companion patent application for the details of the pumping power in connection withwhich the improved jack is intended to be used. This statement is not to be regarded as a limitation because the jack may be employed in con- 7 nection with other powers.

Pulling and releasing actions of the cable or rod 4 will result in a reciprocation of the flexible element 3 so that the suction rod 5 is moved up and down. The direction of movement of the rod will be rectilinear. The rod will not be subject to any curvature. As the primary chain component 34 moves under the influence of the cable 4 the counterweight 33 will reciprocate in the guides defined by the perpendicular beams 10. The second component 35, being connected with the counterweight, will transfer the power to the secondary chain grip 43 and so to the sucker rod 5. It has been explained already that the chains 34 are relatively close together so that the primary application of the power is confined to the substantial axis of the counterweight 33. The chains 35 are spread considerably further apart, the result being an'equalized action upon the sucker rod.

Should the occasion arise to swing the superstructure 2 back into the dotted line position in Figure 2, it is only necessary to remove the hinge pins 26 and 31. The struts 14 can be swung back upon the hinge pins 28 out of the way. 7 The rest of the superstructure may then be swung as far back as necessary. Nothing else will come apart, and said superstructure will move as a unit. Additions and subtractions of the weight elements to the counterweight 33 may be readily made as already described.

While the construction and arrangement of the improved pump jack is that of a generally preferred form, obviously modifications and changes may be made without departing from the spirit of the invention or the scope of the claims.

I claim l. A pump jack comprising a flexible element connectible with a sucker rod and with a power element, a structure having idlers over which theflexible element is trained so that one component hangs directly over the sucker rod, a movable mounting for the structure permlttlng swlnging it, and a countercomponents ofa flexible element, a structure having idlers over which the chains are trained, means by which a power element is coupled to one end ofthe primary component, means riding upon a part of the structure, at which the remaining end of the primary component is connected, and at which the ends of the chains of the secondary component are connected relatively far apart, and means by which the remaining ends of'said chains are coupled with a sucker rod at the same spacing to effect an equalization of the applied power.

3. A pump jack comprising a flexible element which includes pairs of chains that constitute primary and secondary components of a flexible element, a structure upon which said element is supported, sets of idlers over which the chains are trained, the primary chains being relatively close and the secondary chains being relatively far apart, coupling means by which the remote ends of the chain components are respectively connected with a power element and with a sucker rod, and means riding upon a part of the structure to which the primary component is connected at the axial center, and to which the secondary component is connected at each side of said center. i

4. A pump jack comprising a flexible operating element, a structure having idlers over which said element is trained, a base, and hinges connecting the structure with the base, including hinge pins that are removable to permit swinging. the structure in either of two directions in respect to the base.

5. In a pump jack, a superstructure which has sets of hinge knuckles on opposite sides, a base which has corresponding hinge knuckles, and pins fitted in corresponding knuckles to rigidly secure the superstructure upon the base, the pins on either side being removable to permit swinging of the superstructure in either of two directions. g

6. In a pump jack, a superstructure having ears and hinge knuckles on opposite sides, a base having hinge knuckles corresponding with those of the superstructure and having other hinge knuckles, hinge pins connecting the first hinge knuckles being placed to either hold the superstructure rigid or permit swinging in either of two directions, struts having hinge knuckles co-acting with said other hinge knuckles, and hinge pins connecting said last hinge knuckles and the struts with the ears, either holding the superstructure rigid or permitting said swinging when the hinge pins are removed from the ears and struts.

7. In a pump jack, a flexible operating element including chains, a two-part yoke secura-hle upon a sucker rod, arms upon the yoke receiving the chains therebetween, teeth on certain ones of the arms fitting in spaces between certain chain links and means securing the arms and extendingthrough the spaces.

8. A pump jack comprisinga flexible reciprocable element, a framework over which the element is guided includingconfronting channels, and a counterbalancing Weight connected to said element being received by and guided in said channels.

Signed at Tulsa in the county of Tulsa and State of Oklahoma.

LAVJRENCE G. BURT. 

